From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-11-19T19:50:30+09:00
Subject: Re: Is there a way to know what are the subclasses of a given class ?

On Wed, Nov 19, 2008 at 11:36 AM, Michael Fellinger
<m.fellinger@gmail.com> wrote:
> On Wed, Nov 19, 2008 at 7:12 PM, Jesús Gabriel y Galán
> <jgabrielygalan@gmail.com> wrote:

> Little different style maybe:
>
> class A
>  @subclasses = []
>  def self.inherited(into) @subclasses << into end
>  def self.subclasses() @subclasses end
> end

Yep, much cleaner :-).
I made a mess while I was typing in irb about closing the << self early,
and forgetting to initialize the array, so that was the result. I
probably wanted to type this:

irb(main):001:0> class A
irb(main):002:1> class << self
irb(main):003:2> attr_reader :subclasses
irb(main):004:2> def inherited(child)
irb(main):005:3> subclasses << child
irb(main):006:3> end
irb(main):007:2> end
irb(main):008:1> @subclasses = []
irb(main):009:1> end

but anyway your version is cleaner...

Jesus.